Dental plugger.



W. A. SALT.

DENTAL PLUGGER.

APPLIOATION FILED FEB. 14, 1911.

1,@40,424:. Patented Oct-8,1912.

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WILLIAM AMBROSE SALT, 0F PROVIDENCE, ISLAND, ASSIGNOR OF ONE-HALF TO STEPHEN H. BRIGGS, OF BROVIDENCE, RHODE ISLAND.

DENTAL PL'UGGER. I

Specification of Letters Patent.

Patented Oct 8, 1912.

To all whom z'tmay concern:

Be it known that I, WILLIAM AMBRosn SALT, a citizen of the United States, residing at Providence, county of Providence, and State of Rhode Island, have invented a new and useful Improvement in Dental Pluggers, of which the following is a specification.

This invention has reference to an improvement in dental pluggers and more particularly to an improvement in dental plugers adapted to be detachably secured to a dental hand-piece driven by the flexible-shaft Of a motor.

The above form of dental pluggers are usually complicated in construction, expensive to manufacture, are large and cumbersome, they extend out too far from the end of the hand-piecefor convenience in opera adjusting the length of stroke, this device is. in an inconvenient position to adjust and cannot usually be ad uSted by the operator, when the plugger is in actual operation.

The object ofmy invention is to improve the construction and operation of a dental plug er, whereby the plugger is detachably attac ed to a dental hand-piece, is positively secured to the end of the hand-piece in any position required, is'adjustable to give any length of stroke desired and the length ofthe stroke regulated while in operation, from the minimum to the maximum force or thrown entirely out of operation by a simple pressure of the thumb or finger.

Another object of my invention is to reduce the size and simplify the construction of a dental plugger embodying the above features, thereby reducing the cost of manufacturing the same.

My invention consists in the peculiar and novel' construction of. a dental plugger adapted to be detachably secured to a dental hand-piece and operated by the flexible shaft of a motor, said dental plugger having details of construction, as will be more fully set forth hereafter and claimed.

Figure 1. is a side view of my improved dental plugger in its operative position on a dental hand-piece, shown in dotted lines. Fig. 2. is an enlarged longitudinal sectional view of the plugger. Fig. 3. is an enlarged transverse sectional view through the plugger, taken on line 3. 3. of Fig. 1. Fig. 4. is an enlarged end view of the reciprocating 'to the flexible shaft of a motor and having on its inner end the usual grip for i pin any one of the dental tools used in t e an piece and a lever for controlling the grip, all of which is well known. The plugging tool 8. has the usual screw-threadedend 9. as shown in Fig. '2.

The plugger 6. consistsof a cylindrical body member 10. having a circular stepped chamber 11., a longitudinal groove 12. in the wall of the chamber, a radial hole 13. extending outward from the chamber 11. through the body member 10., and a tapered end 14. in which is a screw-threaded hole 15. which extends from the outer end into the chamber 11. A screw-threaded sleeve 16. in the screw-threaded hole 15. and having a central longitudinal hole 17. and a knurled flanged outer end 18. A reciprocatory stem 19. which extends through the hole 17 in the sleeve 16. and has in its outer end a screwthreaded hole 20., and an external annular roove 21., and on its inner end a circular 'ead 23. constructed to have an inclined radial notch 24., a lug 25. on its face adjacent its periphery and a pin 26. which enters the groove 12. -A splitrring 22. in the annular groove 21. said ring limiting the inward movement of the reciprocatory stem 19. A coiled spring 27. surrounds the reciprocatory stem 19. and enga es with the inner end of the sleeve 16. and ead 23., the tension of the coiled spring holding the reciprocatory stem in its inward position under spring tension. A rotatable shaft 28. in the body member 10, and having on the inner end a circular head 30. which has lug 31. on its face in a position to engage the lug 25. and notches 32. in its outer end, by which the shaft is detachably secured in the hand-piece 7., by the grip in the hand-piece. A holding member 33. secured in the end of the body member 10. by screws and having a tapered hole 34. adapted to fit over the tapered end of the hand-piece 7., a radial screw-threaded hole 35. in which is a fastening screw 36, having a lever arm 37. A 110 by screwing i the tapered end of the hand-piece.

the plugger' is in spring arm 38. secured atone end to the holding member 33, by a screw, and a controlling pin 39. secured to the free end of the spring arm 38. and having a head 40., on its outer end and a pointed inner end 41. which extends through the hole 13. and enters the inclined notch 24. the head of the reciprocating member19. as shown in Figs. 2. and 8.

Then in use, firmly secured to the-reciprocatory stem 19.

ed hole 20. and the rotating shaft 28. inserted into the end of hand-piece 7. and gripped by the grip in the hand-piece in the usual way.

hole 84;, the plugger is ,rotatably adjusted on the hand-piece toposition the plugging tool 8. and the controlling pin 39. and the plugger firmly secured to the hand-piece 7 4 by the fastening screw 36. which engages The rotation' of the shaft28. causes the lug 31.

on the inner face of the head 30. to engage with the lug 25. on the outer face of the head. 26. and force the member 19. and tool 8. outward, thereby giving the blow, against the tension of the coiled spring 27 which causes the head 26 and its stem 19. to rebound. I The point of the tool 8. is thus caused to give rapid, regular and direct blows. The plugger may be set togive a predetermined length of stroke, -by turning the sleeve 16. by the knurled flanged end 18. whichbeing at the end of the plugger, is in a convenient position for the operator. The turning of the sleeve moves the reciprocatory stem 19. lengthwise, to bring the lug 25. more or less into engagement with the lug 31. The length of the stroke is now accurately regulated, while operation, by pressure on the regulating pin 39.,an inward movement ofv-the pin forcingthereciprocatory stem 19.

outward against the tension of the coiled' spring 27 thereby decreasing the length of the stroke. When the pressure is released from the regulating pin, it returns to its normal position through the action of the spring arm 38. By this construction, the

operator has the plugger under perfect control when it is in operation, the pluggermay the plugging tool 8. is,

the same into the screw-thread- The tapered end of the handpiece (not shown) now'fits into the tapered 16. to the right or left,

hand piece and means be set, while in operation,-for any length of stroke required for the maximum force, and the force of the blows is accurately regulated from the minimum to the maximum force. By forcing the controlling pin 39. inward to its limit, the lug 25. is carried out' of the path of the lug ESL-thereby stopping the reciprocating movement of the reciprocatory stem 19, and plugging tool 8. for picking up pieces of gold, in filling teeth,io'r for other purposes, without stopping the motor or other source of power.

'Having thus described my invention, I claim as new and-desire to secure'by Letters Patent A dental plugger, nation, a two part chambered body member having a screw-threaded hole extending from the chamber through the forward end,

a screw-threaded sleeve in the hole and 'having a knurled flanged outer end, a reciprocatory stem extending through the sleeve and having adjacent its outer end an annular groove, a ring in the annular groove, a circular. head on the inner end offl the reciprocatory stem and having an inclined radial V shaped notch in its face, and provided with a lug on its face, surrounding the reciprocatory stem and en gaging the sleeve and the head on the stem,

.a rotatable shaft having a circular head on its inner end and a lug on the face of ,the,

head'in a position to engage'the lug on the head of the reciprocatory stem, a spring actuated controlling pin extending through the bodyand having an inverted cone'shape inner end, adapted .to enter and permanently engage the radial notch in the head of the reciprocatory stem, means for hold ing the reciprocatory stem-against rotation, means for detachably securing the shaftto the grip .in a dental hand piece,'means. for detachably securing the body to the dental for detachably securing a plugging tool to the outer end of the reciprocatory stem. I

In testimony whereof, Ihave signed'my name to this specification in the presence fof two subscribing witnesses.

WILLIAM AMBROSE SALT. Witnesses:

' JOHN H. M.'NULTY, CHAS. H. LUTHER.

comprising in combia coiled spring 

